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litestar-custom-types

Register decoders and encoders for custom domain types in Litestar.

7|1|Updated Mar 2, 2026
Search Tags:#openapi#serialization#schema-validation#custom-types#litestar#type-decoding#type-encoding
One-click install
npx skills add https://github.com/alti3/litestar-skills --skill litestar-custom-types
Or copy as Structured Prompt for Agent▼
Please help me install this Agent Skill.
Skill: litestar-custom-types
Source: https://github.com/alti3/litestar-skills/tree/main/plugins/litestar/skills/litestar-custom-types
Command: npx skills add https://github.com/alti3/litestar-skills --skill litestar-custom-types

SYSTEM DOCUMENTATION & REQUIREMENTS

What problem does it solve?

Litestar applications often require handling domain-specific values that default serializers can't interpret. This skill provides a reliable pattern for decoding and encoding such custom types, ensuring inputs/outputs remain strongly typed and API schemas stay accurate.

Core Features & Use Cases

  • Register type decoders and encoders at the appropriate layer to enable seamless round-trips for custom domain values.
  • Preserve OpenAPI schema generation while supporting nonstandard representations, improving client compatibility and validation.
  • Use cases include handling domain values like ids, codes, or enums that don't map to built-in scalars, with end-to-end validation and test coverage.

Quick Start

Define the domain type, register decoders/encoders, and wire it into Litestar route handlers.

Frequently Asked Questions about litestar-custom-types

High-intent search queries and answers about installing and using this skill.

FAQPage Schema
How do I handle custom domain types in Litestar for serialization and OpenAPI schema generation?▼

Handling custom domain types in Litestar for serialization involves registering type decoders and encoders to ensure type-safety and accurate OpenAPI schemas. This pattern enables seamless round-trips for nonstandard domain values.

Why does my Litestar OpenAPI schema break when using custom domain types?▼

Litestar OpenAPI schemas break because default serializers cannot interpret domain-specific values. Registering custom type decoders and encoders preserves schema generation while supporting nonstandard representations for client compatibility.

How do I register type decoders and encoders in Litestar to support custom types?▼

To register type decoders and encoders in Litestar, define your domain type, wire the decoders and encoders at the appropriate layer, and connect them to Litestar route handlers to maintain deterministic round-trip behavior.

Does Litestar support type-safety for domain-specific values that don't map to built-in scalars?▼

Litestar supports type-safety for domain-specific values by registering custom type decoders and encoders. This provides end-to-end validation, backward-compatible serialization, and robust test coverage for values like ids or enums.

What is the best way to ensure deterministic round-trip behavior for custom types across Litestar API boundaries?▼

Ensuring deterministic round-trip behavior for custom types across Litestar API boundaries requires registering centralized type decoders and encoders. This approach maintains type-safety and accurate schema validation during inputs and outputs.

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